Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NVfiledCriticalPhilips Gloeilampenfabrieken NV
Priority to ES0007171UpriorityCriticalpatent/ES7171Y/en
Publication of ES7171UpublicationCriticalpatent/ES7171U/en
Application grantedgrantedCritical
Publication of ES7171YpublicationCriticalpatent/ES7171Y/en
An indirect heating cathode realized in such a way that one or more conductors are freely arranged inside a piece, for example tubular conductive material, then the remaining space is filled with insulating material and the assembly thus obtained is reduced to the dimensions of the shape or both, which is desired by stretching laminate or other analogous operations; the essential feature of this procedure being that one or several conductors are made in helix. (Machine-translation by Google Translate, not legally binding)